nav·i·ga·tion /ˌnævəˈɡeɪʃən/ ●○○ noun [uncountableU] 1 TTSGthe science or job of planning which way you need to go when you are travelling from one place to another 航行学;航海术;航空术 compasses and other instruments of navigation 罗盘及其他导航仪器
2 TTWTTAwhen someone sails a ship along a river or other area of water 〔水上的〕航行 Navigation becomes more difficult further up the river. 越往河的上游,航行越困难。
—navigational adjectiveadj [only before noun]